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丁啟峰¹，李文江¹，孫  源¹，李  乾²

（1. 石家莊鐵道大學(xué) 土木工程學(xué)院，河北 石家莊 050043； 2. 國網(wǎng)河北省電力有限公司 石家莊供電分公司 河北 石家莊 050000）

 

摘 要：針對頂管隧道鄰近剛性管線施工安全距離問題，借助有限差分程序和梁—彈簧模型，采用兩階段法，對凈空2.6 m′2.4 m 矩形頂管電纜隧道在軟黏土地層施工時土體變位特征進(jìn)行研究。分析頂管平行下穿地下剛性管線時管—隧凈距、管材和管徑對剛性管線最大拉應(yīng)力的影響，并根據(jù)服務(wù)年限對管線強(qiáng)度控制標(biāo)準(zhǔn)進(jìn)行了修正，確定頂管下穿管線的安全施工距離。結(jié)果表明：管線最大變形曲率與最大拉應(yīng)力隨著頂管與管線間距的增大呈指數(shù)性衰減；同種材質(zhì)下，管線管徑越大，施工擾動導(dǎo)致的最大拉應(yīng)力越大；③管—隧凈距及管線管徑一定時，鋼管的最大拉應(yīng)力最大，球磨鑄鐵管其次，灰口鑄鐵管最小。

關(guān)鍵詞：矩形頂管；剛性管線；平行下穿；兩階段法；變形特征；安全距離

中圖分類號： U455.47            

文獻(xiàn)標(biāo)志碼：A       

文章編號：1005-8249（2024）02-0064-06

      DOI: 10.19860/j.cnki.issn1005-8249.2024.02.012                                        

DING Qifeng1，LI Wenjiang1，SUN Yuan1，LI Qian2

(1. College of Civil Engineering, Shijiazhuang TieDao University, Shijiazhuang 050043, China; 2. Shijiazhuang Power Supply Branch, Hebei Electric Power Co., Ltd., Shijiazhuang 050000, China)

Abstract: Aiming at the construction safety distance problem of pipe jacking tunnel adjacent to rigid pipeline, with the help of finite difference program and beam-spring model, using two-stage method, the soil change of a rectangular pipe jacking cable tunnel with a clearance of 2.6 m′2.4 m in soft clay ground is analyzed，bit characteristics were studied. The influence of the pipe-tunnel clear distance, pipe material and pipe diameter on the maximum tensile stress of the rigid pipeline was analyzed when the pipe jacking was parallel to the underground rigid pipeline. The safe construction distance of the pipeline under the pipe. It proued that:the maximum deformation curvature and the maximum tensile stress of the pipeline decay exponentially with the increase of the distance between the jacking pipe and the pipeline; Under the same material, the larger the diameter of the pipeline, the greater the maximum tensile stress caused by the construction disturbance. The greater the stress;when the clear distance between the pipe and the tunnel and the diameter of the pipeline are constant, the maximum tensile stress of the steel pipe is the largest, followed by the ductile iron pipe, and the gray cast iron pipe is the smallest.

Keywords: rectangular pipe jacking；rigid pipeline；parallel downward penetration；two-stage method；

基金項目： 國家電網(wǎng)河北電力公司科技項目（KJ2020-003）。

作者簡介：丁啟峰（1998—），男，碩士研究生，主要研究方向：隧道工程穩(wěn)定性研究。

通信作者：李文江（1970—），男，博士，教授，主要研究方向：隧道工程穩(wěn)定性理論，地下工程環(huán)境控制及新技術(shù)方面研究。

收稿日期：2023-09-15